#导入socket库：
import socket

#创建一个socket：
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
#建立连接:
s.connect(('www.sina.com.cn',80))
#发送数据：
s.send(b'GET / HTTP/1.1\r\nHost: www.sina.com.cn\r\nConnection: close\r\n\r\n')
#接收数据
buffer = []
while True:
    #每次最多接收1K字节
    d = s.recv(1024)
    if d:
        buffer.append(d)
    else:
        break;
data = b''.join(buffer)
s.close()
header,html = data.split(b'\r\n\r\n',1)
print(header.decode('utf-8'))
#把接收的数据写入文件
with open('sina.html','wb') as f:
    f.write(html)